MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Advances Included in Servicing Advances Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Total	$ 385,927	$ 398,820
Servicer Advances Receivable
Schedule of Equity Method Investments [Line Items]
Principal and interest advances	575,916	664,495
Escrow advances (taxes and insurance advances)	1,159,663	1,426,409
Foreclosure advances	763,999	754,073
Total	2,499,578	2,844,977
Servicer advances receivable related to agency MSRs	447,600	526,500
Servicer advances receivable related to Ginnie Mae MSRS, recoverable from Ginnie Mae	221,200	261,800
Servicer advances, unamortized discount and accrual	$ 51,700	$ 19,500